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What is ICS94236?

This electronic component, produced by the manufacturer "Integrated Circuit System", performs the same function as "Programmable System Clock Chip".


ICS94236 Datasheet PDF - Integrated Circuit System

Part Number ICS94236
Description Programmable System Clock Chip
Manufacturers Integrated Circuit System　
Logo Integrated Circuit System Logo　


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Integrated
Circuit
Systems, Inc.
ICS94236
Programmable System Clock Chip for AMD - K7™ processor
Recommended Application:
VIA KX/KT133 style chipset
Output Features:
• 1 - Differential pair open drain CPU clocks
• 1 - CPU clock @ 3.3V
• 13 - SDRAM @ 3.3V
• 6 - PCI @3.3V,
• 1 - 48MHz, @3.3V fixed.
• 1 - 24/48MHz @ 3.3V
• 2 - REF @3.3V, 14.318MHz.
Features:
• Programmable ouput frequency.
• Programmable ouput rise/fall time.
• Programmable PCI_F and PCICLK skew.
• Spread spectrum for EMI control typically
by 7dB to 8dB,
with programmable spread percentage.
• Watchdog timer technology to reset system
if over-clocking causes malfunction.
• Uses external 14.318MHz crystal.
• FS pins for frequency select
Pin Configuration
VDDREF
REF0
GND
X1
X2
VDDPCI
1FS4/PCICLK_F
**FS3/PCICLK0
GND
*SEL24_48#/PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDPCI
BUFFER IN
GND
SDRAM11
SDRAM10
VDDSDR
SDRAM9
SDRAM8
GND
SDATA
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48 REF1/FS2**
47 GND
46 CPUCLK
45 GND
44 CPUCLKC0
43 CPUCLKT0
42 VDDCPU
41 PD#*
40 SDRAM_OUT
39 GND
38 SDRAM0
37 SDRAM1
36 VDDSDR
35 SDRAM2
34 SDRAM3
33 GND
32 SDRAM4
31 SDRAM5
30 VDDSDR
29 SDRAM6
28 SDRAM7
27 VDD48
26 48MHz/FS0*
25 24/48MHz/FS1**
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD.
** Internal Pull-down Resistor of 120K to GND.
1 Internal Pull-down Resistor of 60K to GND.
Block Diagram
PLL2
X1 XTAL
X2 OSC
PLL1
Spread
Spectrum
/2
CPU
DIVDER
SEL24_48#
SDATA
SCLK
FS (4:0)
PD#
Control
Logic
Config.
Reg.
PCI
DIVDER
SDRAM
DRIVER
BUFFER IN
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0451A—01/10/03
48MHz
24_48MHz
REF (1:0)
CPUCLK
CPUCLKC0
CPUCLKT0
PCICLK (4:0)
PCICLK_F
SDRAM (11:0)
SDRAM_OUT
Functionality
FS3 FS2 FS1 FS0
0000
000 1
00 10
00 11
0 100
0 10 1
0 110
0 111
10 0 0
100 1
10
10
10 11
1 10 0
110 1
1 1 10
1111
CPU
(MHz)
95.00
100.00
102.00
105.00
110.00
113.00
115.00
120.00
133.33
135.00
137.00
139.00
141.00
143.00
145.00
150.00
PCICLK
(MHz)
31.67
33.33
34.00
35.00
36.67
37.67
38.33
40.00
33.33
33.75
34.25
34.75
35.25
35.75
36.25
37.50
* 16 additional frequency selectables via FS4, refer to page5
for frequency table.

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ICS94236 equivalent
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ICS94236
Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register (default = 0)
Bit
Description
PWD
Bit2 Bit7 Bit6 Bit5 Bit4 CPUCLK PCICLK
FS4 FS3 FS2 FS1 FS0 MHz
MHz
Spread %
0 0 0 0 0 95.00
31.67
0.45% Center Spread
0 0 0 0 1 100.00 33.33
0.45% Center Spread
0 0 0 1 0 102.00 34.00
0.45% Center Spread
0 0 0 1 1 105.00 35.00
0.45% Center Spread
0 0 1 0 0 110.00 36.67
0.45% Center Spread
0 0 1 0 1 113.00 37.67
0.45% Center Spread
0 0 1 1 0 115.00 38.33
0.45% Center Spread
0 0 1 1 1 120.00 40.00
0.45% Center Spread
0 1 0 0 0 133.33 33.33
0.45% Center Spread
0 1 0 0 1 135.00 33.75
0.45% Center Spread
0 1 0 1 0 137.00 34.25
0.45% Center Spread
0 1 0 1 1 139.00 34.75
0.45% Center Spread
0 1 1 0 0 141.00 35.25
0.45% Center Spread
0 1 1 0 1 143.00 35.75
0.45% Center Spread
Bit 0 1 1 1 0
(2,7:4) 0 1 1 1 1
145.00
150.00
36.25
37.50
0.45% Center Spread
0.45% Center Spread Note 1
1 0 0 0 0 100.90 33.63
0.45% Center Spread
1 0 0 0 1 100.00 33.33
0 to - 0.7% spread
1 0 0 1 0 103.00 34.33
0.45% Center Spread
1 0 0 1 1 107.00 35.67
0.45% Center Spread
1 0 1 0 0 117.00 39.00
0.45% Center Spread
1 0 1 0 1 120.00 30.00
0.45% Center Spread
1 0 1 1 0 123.00 30.75
0.45% Center Spread
1 0 1 1 1 125.00 31.25
0.45% Center Spread
1 1 0 0 0 133.33 33.33
0 to - 0.7% spread
1 1 0 0 1 133.90 33.48
0.45% Center Spread
1 1 0 1 0 147.00 36.75
0.45% Center Spread
1 1 0 1 1 151.00 37.75
0.45% Center Spread
1 1 1 0 0 153.00 38.25
0.45% Center Spread
1 1 1 0 1 155.00 38.75
0.45% Center Spread
1 1 1 1 0 160.00 40.00
0.45% Center Spread
1 1 1 1 1 200.00 50.00
0.45% Center Spread
Bit 3
0-Frequency is selected by hardware select, latched inputs
1- Frequency is selected by Bit 2,7:4
0
Bit 1
0- Normal
1- Spread spectrum enable
1
Bit 0
0- Running
1- Tristate all outputs
0
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Note: Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3.
0451A—01/10/03
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for ICS94236 electronic component.


Information Total 17 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
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ICS94236The function is Programmable System Clock Chip. Integrated Circuit SystemIntegrated Circuit System

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